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authorAKASHI Takahiro <takahiro.akashi@linaro.org>2014-04-30 09:54:32 (GMT)
committerWill Deacon <will.deacon@arm.com>2014-05-29 08:04:31 (GMT)
commitaf64d2aa872a174772ffc00e2558083f70193acb (patch)
tree28f7400e62fa0e764cb12761d103362480dcd6ed /scripts/recordmcount.pl
parent26e2ae39995469b9289aa1ec0144e256d56eb044 (diff)
downloadlinux-af64d2aa872a174772ffc00e2558083f70193acb.tar.xz
ftrace: Add arm64 support to recordmcount
Recordmcount utility under scripts is run, after compiling each object, to find out all the locations of calling _mcount() and put them into specific seciton named __mcount_loc. Then linker collects all such information into a table in the kernel image (between __start_mcount_loc and __stop_mcount_loc) for later use by ftrace. This patch adds arm64 specific definitions to identify such locations. There are two types of implementation, C and Perl. On arm64, only C version is used to build the kernel now that CONFIG_HAVE_C_RECORDMCOUNT is on. But Perl version is also maintained. This patch also contains a workaround just in case where a header file, elf.h, on host machine doesn't have definitions of EM_AARCH64 nor R_AARCH64_ABS64. Without them, compiling C version of recordmcount will fail. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: AKASHI Takahiro <takahiro.akashi@linaro.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'scripts/recordmcount.pl')
-rwxr-xr-xscripts/recordmcount.pl5
1 files changed, 5 insertions, 0 deletions
diff --git a/scripts/recordmcount.pl b/scripts/recordmcount.pl
index 91280b8..397b6b8 100755
--- a/scripts/recordmcount.pl
+++ b/scripts/recordmcount.pl
@@ -279,6 +279,11 @@ if ($arch eq "x86_64") {
$mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_ARM_(CALL|PC24|THM_CALL)" .
"\\s+(__gnu_mcount_nc|mcount)\$";
+} elsif ($arch eq "arm64") {
+ $alignment = 3;
+ $section_type = '%progbits';
+ $mcount_regex = "^\\s*([0-9a-fA-F]+):\\s*R_AARCH64_CALL26\\s+_mcount\$";
+ $type = ".quad";
} elsif ($arch eq "ia64") {
$mcount_regex = "^\\s*([0-9a-fA-F]+):.*\\s_mcount\$";
$type = "data8";